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In a given sample studying corona virus infectiousness, 13% of infected people were youth and 66% were elderly

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In a given sample studying corona virus infectiousness, 13% of infected people were youth and 66% were elderly. Moreover, of not infected people, 46% were adults and 11% were elderly. If you know that 73% of the sample received negative test result (i.e. not infected), and events are mutually exclusive and collectively exhaustive; Assume that infected and adult are two independent events, find the probability that a person is infected or adult? [5 points) b. Find the probability that a person is infected if he/she is an youth?